How to Diagnose and Fix the Thermador Dishwasher E15 Error

If your Thermador dishwasher is flashing an E15 error code, it can be frustrating—especially if you don’t know what it means or how serious the problem is. The good news? This guide walks you through the causes, possible DIY solutions, and when it’s best to call in the pros.

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What Does the E15 Error Code Mean?

The E15 error on Thermador dishwashers usually points to a water leak or moisture in the base of the machine. Essentially, the dishwasher's leak detection system has been triggered. When this happens, the appliance automatically shuts off the water intake to prevent flooding or further damage.

Common Causes of the E15 Error

Several things can cause this error:

• Leaky hoses or seals

• Clogged or overflowing drain system

• Cracked water tank or base

• Loose connections inside the dishwasher

• Excess detergent or the wrong kind of soap causing too much suds

Understanding what’s behind the error is the first step toward solving it.

Step-by-Step: How to Fix the E15 Error on a Thermador Dishwasher

Before you call anyone, you might want to try fixing it yourself. Here's how:

1. Unplug the Dishwasher

Safety first. Always disconnect the appliance from power before starting any work.

2. Tilt the Dishwasher to Drain the Base

Carefully tilt the dishwasher backward at a 45-degree angle (you may need help with this). If water is present in the base, it will drain out. This often resets the error and allows the unit to function—temporarily.

3. Check for Leaks

Once drained, remove the kick plate and inspect the bottom of the dishwasher. Look for:

• Wet spots

• Cracks in the plastic base

• Damp insulation

• Leaking hoses or connectors

Dry any visible water using a towel or sponge.

4. Inspect the Float Switch

The float switch detects water in the base. If it's stuck or damaged, it may trigger the error. Gently lift and lower it. If it doesn’t move freely, it might need to be cleaned or replaced.

5. Run a Short Test Cycle

Plug the machine back in and run a quick wash cycle to check if the error returns. If it does, the leak may still be present or the float switch may still be detecting moisture.

When You Should Call a Professional

Get Professional Help Today!

If you’ve gone through the steps above and the E15 error keeps showing up, it’s time to call in an expert. Persistent leaks can cause serious water damage to your kitchen floor or cabinetry if left unresolved.

We offer a free service call with repair, so you’re not paying extra just to have us take a look. You can also book online and get $25 off your repair—perfect if your dishwasher needs a replacement part or more advanced diagnostics.

Final Thoughts

While it’s possible to clear the Thermador dishwasher E15 error on your own, recurring issues usually mean there’s an underlying problem that needs professional attention. Whether it’s a faulty sensor or a hidden leak, we’re here to help fix it right the first time.